Sight



Aug. 22, 1944. w. A. scHAlcH SIGHT Filed Aug. 21, 1943 0 /3 /Zd E@ /4 Syvum/Wo@ Wilbur A Scheich f do. otuwltllillal. lNSTRUNIENW Patented Aug. 22, 1944 uuuwn swim I UNITED STATES PATENT OFFICE (Granted under the act of March 3, 1883, as

amended April 30, 1928; 370 0. G. '757) 11 Claims.

The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to a sight for a rearm and particularly to a rear sight having provision for elevation and windage adjustment.

It is an object of this invention to provide an adjustbale rear sight for a firearm capable of adjustment over a full range of windage and elevation and composed of simple, rugged parts which are particularly susceptible of large quantity manufacture.

It is a particular object of this invention to provide an improved adjustable rear sight for a fireram of the type disclosed in U. S. Patent 1,892,141 to John C. Garand.

The specific nature of the invention as well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment as shown in the accompanying drawing in which:

Fig. l is a side elevational view of the si-ght shown mounted on the receiver of a rearm.

Fig. 2 is an enlarged top elevational View partly in section, of the sight shown in Fig. 1.

Fig. 3 is an enlarged side elevational View partly in section taken along plane 3-3 of Fig. 2 showing the sight member mounted in the sight block.

Fig. 4 is a View similar to Fig. 3 but showing the ybattle sight in firing position.

Fig. 5 is an enlarged left end elevational view of Fig. 1 shown partly in section.

Fig. 6 is an enlarged end elevational view of the windage knob showing the raised projections on the surface thereof.

Referring to the drawing this improved sight comprises a sight member I mounted in a sight block 20 which is in turn mounted on a windage screw 30. Windage screw 30 is supported in suitable holes in a pair of brackets 4I and 42. While the brackets 4I and 42 are shown as comprising integral parts of the receiver of a rearm of the type shown in U. S. Patent 1,892,141 it is obvious that the brackets may form a separate member Which is suitably secured to any rearrn. The windage screw 30 has an enlarged head portion 3| which abuts against the side wall of bracket 4I. The portions 32 and 33 of windage yscrew 30 which pass through the holes in the brackets 4I and 42 respectively are supported .by the brackets in bearing relation. The intermediate portion 35 of the windage screw 30 which lies between bearing portions 32 and 33 is threaded with a relatively line thread.

The sight block 20 comprises a rectangular block member provided with a transverse threaded hole 2I through which the windage screw 30 is threaded and thereby supports the sight block on the receiver 50. A vertical threaded hole 22 is provided in the rear portion of the sight block 20 located such that vertical threaded hole 22 does not intersect transverse threaded hole 2|.

The sight member IU is provided with` a threaded body portion II by means of which the member I0 is supported in the vertical threaded hole 22 in the sight block 20. The head of the sight member III is shaped to form a sight I2 having an aperture |2a. The diameter of the sight aperture I2a is a minimum value in the center of the sight member I 0 and increases toward both the front and rear surfaces of the sight member I Il forming conical surfaces I3 and I4 respectively. With this arrangement the sight aperture I2a is equally effective whether the conical surface I3 or the conical surface I4 is in the rearward position adjacent the eye of the user. This double cone aperture will, of course, prevent reflected light from reaching the eye of the user and is equally as effective as a conventional single cone aperture.

On each side of the stem portion II of the sight member IU there are provided flat surfaces I5 and I6 respectively parallel to each other and to the axis of the aperture I2. Either the flat surface I5 or the ilat surface I6 is engaged by a latch I'l to yieldingly hold the sight member IU from rotating. The latch I1 comprises'an L-shaped piece of pressed metal which ts over the top and side wall of the sight block 20. The long arm I8 of the latch I'I is adjacent the side wall of sight block 2|] and is provided with a hole I9 which surrounds the Windage screw 30. The short arm 23 of the latch Il lies on the top surface of the sight block 20 and engages either the flat surface I5 or I6 of the sight member I0. The latch Il is resiliently held in position by a helical spring 4U which surrounds the windage screw 30 and operates between the inside surface of bracket 42 and the arm I8 of the latch member Il.

The other end 33' of Windage screw 30 is slightly reduced in diameter and projects beyond bracket 42. A windage knob 46 is screwed onto reduced diameter portion 33' of windage screw 3U when the sight is assembled to the firearm. The

outside end of windage knob 46 is provided with a countersink 34 surrounding the extreme end portion of the windage screw 3D. After assembly of the sight to the receiver, the eXtreme end 33' of the windage screw 36 may .be peened over by punching a hole 38 in such end and thereby assure the permanent assembly of the sight and positive driving action of the windage knob 46 upon windage screw 36 in both directions of rotation. y

The exterior side of bracket 42 is provided with a pair of mutually perpendicular recesses 43 and 44. Suitable mutually perpendicular projections 3'6 and 31 are provided on the interior surface of windage knob 46 and are shaped to fit snugly in recesses 43 and 44 when the windage knob 46 is properly aligned with respect to these recesses. The shoulder formed on windage screw 36 at the intersection of reduced end portion 33 and bearing portion 33 operates as a stop for the windage knob 46 and when the windage knob 46 is screwed up to its stopped position there should be su'cient lateral play between head 3| of screw 36 and bracket 4| as shown at 52 in Figs. 2 and 5 to permit the projections 36 and 31 on windage knob 46 to be withdrawn from the recesses 43 and 44 and hence permit the rotation of the windage screw 36. The spring 46, of course, exerts sulcient bias to yieldingly hold the projections 36 and 31 in engagement in the recesses 43 and 44 in any windage position of the sight block 26.

Thus windage adjustment of the sight block 20 may be made with the quarter turn intervals which are positively indicated by the projections 36 and 31 snapping into engagement in recesses 43 and 44 under the bias of the spring 46. As the threaded portion 35 has a relatively fine thread it will be apparent that very sensitive windage adjustment may be obtained. At the same time the sight block 26 is positively locked against any lateral movement except that produced by forcibly turning the knob 46.

K Elevation adjustment is obtained by grasping the head portion of the sight member |6 by the ly gers and rotating it, thereby screwing the sight ,-'lrnember |6 up or down in the vertical threaded lgiole 22 in the sight block 26. To accomplish such rotational movement it is necessary to exert sufe i icient force to cam the arm 23 of latch member |1 out of engagement with either the ilat surface I5 or |6 on the sight member |6. Hence half turn intervals of adjustment of elevation positions may be obtained. It will be apparent that any desired degree of sensitivity may be obtained by proper selection of the pitch of the threads of the threaded portion ||of the sight member |6 and the cooperating threads in sight block 26.

If desired, the sight embodying this invention may be readily adapted to be rotated 96 about the windage screw 26 to thereby carry the sight member |6 to a position where it is less susceptible to injury from chance blows when it is not in use. lSuch movement may be obtained by providing the bottom forward edge of the sight block 26 with an arcuate surface 45 produced on a radius about the axis of windage screw 36. This surface will permit the entire sight block to be rotated 90 about the windage screw 36. The spring 46 coupled with the interengagement of the projections 36 and 31 of the windage knob 46 in the recesses 43 and 44 of bracket 42 thereby serves an additional function by resiliently securing the sight block 26 in either of its two positions.

The windage position of the sight aperture |2a may be conveniently indicated by a single graduation line 26 on the rear surface of sight block 26 cooperating with a plurality of graduation lines 75 5| provided on the adjacent shoulder of the receiver 56. The elevation position of the sight aperture |2 may be conveniently indicated by graduations 52 produced on both of the flat surfaces I5 and I6 on the sight member I6.

The movement of the sight block may be utilized to bring a fixed battle sight into proper position for emergency use when the adjustable sight member |6 is rotated to its safe position or perchance was left in an elevated position suitable only for long range firing. To mount such battle sight on the sight block 26, a rectangular slot 24 is provided in sight block 26 in such position as to perpendicularly intersect the threaded vertical hole 22. A rectangular plate member 25 is inserted into the slot 24 and is provided with a threaded hole 26 which is in alignment with the threaded hole 22 in the sight block 26. Thus insertion of the sight member |6 within the sight block 26 also secures the rectangular plate 25 to the sight block 26. The rectangular plate `25 is provided with an extension 21 which projects beyond the sight block 26 and a fixed sight aperture 28 is produced in this extension. The distance between the axis of iixed sight aperture 28 and the axis of windage screw 36 is selected so that when the sight block 26 is rotated to the position shown in Fig. 4, the aperture 28 will be located at the height corresponding to battle range for the particular firearm. It is obvious that the extension 21 might be made integral `with the sight block 26.

It will therefore be apparent that this invention provides a simple and rugged sight with a `minimum number of parts, capable of fine adjustment over a wide range of both windage and elevation, spring latched in any selected position of adjustment and capable of rotation about a horizontal axis to move the adjustable sight member to a position of safety from chance blows and also to bring into the sighting axis a fixed aperture set at battle range.

I claim:

1. A firearm sight comprising a pair of spaced brackets, a windage screw rotatably mounted in said brackets, a sight block threadably mounted on said windage screw between said brackets, .said sight block having a vertical threaded hole therein, a sight aperture member having a threaded body portion mounted in said threaded vertical hole, a latch constructed to rest against said sight block and engage the body portion of said aperture member to resist rotation of said aperture member, and a spring mounted around said windage screw arranged to bias said latch into engagement with said aperture member.

2. A rearm sight comprising a pair of spaced brackets, a windage screw rotatably mounted in said brackets, an operating knob secured to one end of said windage screw projecting thru one of said brackets and an enlarged head formed on the other projecting end, said knob and said head being spaced to provide a lateral looseness in said windage screw with respect to said brackets, a plurality of indentations on the side of the bracket adjacent the said operating knob, a plurality of projections on said knob constructed to engage in said indentations, the said lateral looseness of said windage screw with respect to said brackets permitting said projections to be withdrawn from said indentations to permit rotation of said windage screw, a sight block threadably mounted on said windage screw between said brackets, said sight block having a vertical threaded hole therein, a sight aperture member having a threaded body portion mounted in said threaded vertical hole, a latch constructed to rest against said sight block and engage the body portion of said aperture member to resist rotation of said aperture member, and a spring mounted around said windage screw arranged to bias said latch into engagement with said aperture member and simultaneously bias said windage screw to yieldingly hold the projections on said knob in the indentations in said bracket.

3. A firearm sight comprising a pair of spaced brackets, a windage screw rotatably mounted in said brackets, a sight block threadably mounted on said windage screw between said brackets, said sight block having a vertical threaded hole therein, a sight aperture member having a threaded body portion mounted in said threaded vertical hole, said aperture member having at least one flat surface along the threaded body portion, an L-shaped latch abutting against the top and side surfaces of said sight block, the horizontal arm of said L-shaped latch arranged to engage the said flat surface on said aperture member and thereby latch said aperture member against rotation, and a spring surrounding said windage screw and operative between one of said brackets and the vertical arm of said L- shaped latch, thereby holding said latch in engagement with said aperture member.

4. A firearm sight comprising a pair of spaced brackets, a windage screw rotatably mounted in said brackets, an operating knob secured to one end of said windage screw projecting thru one of said brackets and an enlarged head formed on the other projecting end, said knob and said head being spaced to provide a lateral looseness in said windage screw with respect to said brackets, a plurality of indentations on the side of the bracket adjacent the said operating knob, a plurality of projections on said knob constructed to engage in said indentations, the said lateral looseness of said windage screw with respect to said brackets permitting said projections to be withdrawn from said indentations to permit rotation of said windage screw, a sight block threadably mounted on said windage screw between said brackets, said sight block having a vertical threaded hole therein, a sight aperture member having a threaded body portion mounted in said threaded vertical hole, said aperture member having at least one iiat surface along the threaded body portion, an L-shaped latch abutting against the top and side surfaces of said sight block, the horizontal arm of said L-shaped latch arranged to engage the said hat surface on said aperture member and thereby latch said aperture member against rotation, a spring surrounding said windage screw and operative between one of said brackets and the vertical arm of said L-shaped latch, thereby holding said latch in engagement with said aperture member and simultaneously biasing said windage screw to yieldingly hold said projections on said knob in the indentations in said bracket.

5. A rearm sight comprising a pair of spaced brackets, a windage screw rotatably mounted in said brackets, a sight block threadably mounted on said windage screw between said brackets, said sight block arranged to rotate on said windage screw between two 90 displaced positions, a xed aperture on said sight block arranged to lie in the sighting axis of the firearm in one such position, an adjustable aperture member mounted on said sight block and arranged to be brought into the sighting axis of the firearm by rotation of the Search Room sight block to the other displaced position, said adjustable aperture member having a body portion threadably supported in said sight block, a latch arranged to resist rotation of said sight aperture member, and a spring mounted between one of said brackets and said latch, said spring holding said latch in engagement with said aperture member.

6. A firearm sight comprising a pair of spaced brackets, a windage screw rotatably mounted in said brackets, a sight block threadably mounted on said windage screw between said brackets, said sight block arranged to rotate on said windage screw between two 90 displaced positions, a iixed aperture on said sight block arranged to lie in the sighting axis of the rearm in one such position, an adjustable aperture member mounted on said sight block and arranged to be brought into the sighting axis of the rearm by rotation of the sight block to the other 90 displaced position, said adjustable aperture member having a body portion threadably supported in said sight block, a latch constructed to rest against said sight block and engage the body portion of said aperture member, and a spring mounted around said windage screw arranged to bias said latch into engagement with said aperture member.

7. A rearm sight comprising a pair of spaced brackets, a windage screw rotatably mounted in said brackets, a sight block threadably mounted on said windage screw between said brackets, said sight block arranged to rotate on said windage screw between two 90 displaced positions, a fixed aperture on said sight block arranged to lie in the sighting axis of the firearm in one such position, an adjustable aperture member mounted on said sight block and arranged to be brought into the sighting axis of the rearm by rotation of the sight block to the other 90 displaced position, said adjustable aperture member having a body portion threadably supported in said sight block, said aperture member having at least one flat surface along the threaded body portion, an L-shaped latch abutting against the top and side surfaces of said sight block, the horizontal arm of said L-shaped latch arranged to engage the said at surface on said aperture member and thereby latch said aperture member against rotation, and a spring surrounding said windage screw and operative between one of said brackets and the vertical arm of said L-shaped latch, thereby holding said latch in engagement with said aperture member.

8. A firearm sight comprising a pair of spaced brackets, a windage screw rotatably mounted in said brackets, an operating knob secured to one end of said windage screw projecting thru one of said brackets and an enlarged head formed on the other projecting end, said knob and said head being spaced to provide a lateral looseness in said windage screw with respect to said brackets, a plurality of indentations on the side of the bracket adjacent the said operating knob, a plurality of projections on said knob constructed to engage in said indentations, the said lateral looseness of said windage screw with respect to said brackets permitting said projections to be withdrawn from said indentations to permit rotation of said windage screw, a sight block threadably mounted on said windage screw between said brackets, said sight block constructed and arranged to rotate on said windage screw between two 90C' displaced positions, a fixed aperture member on said sight block arranged to lie in the sight ing axis of the firearm in one such position, an adjustable aperture member mounted on said sight block and arranged to be brought into the sighting axis of the rearm by rotation of the sight block to the other 90 displaced position, said adjustable aperture member having a body portion threadably supported in said sight block, a latch constructed to rest against said sight block and engage the body portion of said aperture member to resist rotation of said aperture member, and a spring mounted around said windage screw arranged to bias said latch into engagement with said aperture member.

9. A iirearm sight comprising a pair of spaced brackets, a windage screw rotatably mounted in said brackets, an operating knob secured to one end of said windage screw projecting thru one of said brackets and an enlarged head formed on the other projecting end, said knob and said head bein-g spaced to provide a lateral looseness in said windage screw with respect to said brackets, a plurality of indentations on the side of the bracket adjacent the said operating knob, a plurality of projections on said knob constructed to engage in said indentations, the said lateral looseness of said windage screw with respect to said brackets permitting said projections to be withdrawn from said indentations to permit rotation of said windage screw, a sight block threadably mounted on said windage screw between said brackets, said sight block constructed and arranged to rotate on said windage screw between two 90 displaced positions, a fixed aperture on said sight block arranged to lie in the sighting axis of the firearm in one such position, an adjustable aperture member mounted on said sight block and arranged tobe brought into the sighting axis of the firearm by rotation of the sight block to the other 90 displaced position. said adjustable aperture member having a body portion threadably supported in said sight block, said aperture member having at least one flat surface along the threaded body portion, an L-shaped latch abutting against the top and side surfaces of said sight block, the horizontal arm of said L-shaped latch arranged to engage the said flat surface on said aperture member and thereby latch said aperture member against rotation, a spring surrounding said windage screw and operative between one of said brackets and the vertical arm of said L-shaped latch, thereby holding said latch in engagement with said aperture member and simultaneously biasing said windage screw to yieldingly hold said projection on said knob in the indentations in said bracket.

10. A iirearm sight comprising a pair of spaced brackets, a Windage screw rotatably mounted in said brackets, a sight block threadably mounted on said brackets, said sight block arranged to rotate on said windage screw between two 90 displaced positions, a fixed aperture on said sight block arranged to lie in the sighting axis sof the firearm in one such position, an adjustable aperture member mounted on said sight block and arranged to be brought into the sighting axis of the firearm by rotation of the sight block to the other position, said adjustable aperture member having a body portion threadably supported in said sight block, said aperture mem- -ber having at least one flat surface along the threaded body portion, an L-shaped latch abutting against the top and side surfaces of said sight block, the horizontal arm of said L-shaped latch arranged to engage the said flat surface on said aperture member and thereby latch said aperture member against rotation, a spring surrounding said wiridage screw and operative between one of said brackets and the vertical arm of said L-shaped latch, thereby holding said latch in engagement with said aperture member, elevation graduations on the fiat surface on said aperture member to indicate the height thereof and means on said sight block for indicating the windage position of said aperture member.

11. A firearm sight comprising a pair of spaced brackets, a windage screw rotatably mounted in said brackets, an operating knob secured to one end of said windage screw projecting thru one of said brackets and an enlarged head formed on the other projecting end, said knob and said head being spaced to provide a lateral looseness in said windage screw with respect to said brackets, a plurality of indentations on the side of the bracket adjacent the said operating knob, a plurality of projections on said knob constructed to engage in said indentations, the said lateral looseness of said Windage screw with respect to said brackets permitting Said projections to be withdrawn from said indentations to permit rotation of said windage screw, a sight block threadably mounted on said windage screw between said brackets, said sight block arranged to rotate on said windage screw between two displaced positions, a xed aperture on said sight block arranged to lie in the sighting axis of the firearm in one such position, an adjustable aperture member mounted on said sight block and arranged to be brought into the sighting axis of the rearm by rotation of the sight block to the other 90 displaced position, said adjustable aperture member having a body portion threadably supported in said sight block, said aperture member having at least one at surface along the threaded body portion, an L-shaped latch abutting against the top and side surfaces of said sight block, the horizontal arm of said L-shaped latch arranged to engage the said iiat surface on said aperture member against rotation, a spring surrounding said windage screw and operative between one of said brackets and the vertical arm of said L-shaped latch, thereby holding said latch in engagement with said aperture member and simultaneously` biasing said windage screw to yieldingly hold said projections on said knob in the indentations in said bracket, elevation graduations on the ilat surface on said aperture member to indicate the height thereof and means on said sight block for indicating the windage position of said aperture member.

WILBUR A. SCHAICH. 

